What is the molecular mass of a water molecule?
A)10 amu
B)12 amu
C)15 amu
D)18 amu
E)none of the above

Name: What is the molecular mass of a water molecule? A)10 amu B)12 amu C)15 amu D)18 amu E)none of the above
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Question

Quizplus · Accepted Answer

The molecular formula for water is H2O. The atomic mass of hydrogen is approximately 1 atomic mass unit (amu) and oxygen is approximately 16 amu. Therefore, the molecular mass of water is (2 x 1 amu) + (1 x 16 amu) = 18 amu. Thus, the correct choice is D.

What Is the Molecular Mass of a Water Molecule